Nokia Lumia 638 is the Microsoft Windows Phone 8.1 developed and released by Microsoft in December 2014. It is with 4.5 inches screen, 480x845 display and 5 MP rear camera with Auto Focus (No Front Camera) . It provides 8 GB internal memory, 1 GB RAM and SD Card expandable Up to 128 GB. It is available with many features like runs based on Windows 8.1, Screen is protected with Corning Gorilla glass 3 etc,.Features and Specifications: